From 9d1936d4f6ff120b89e56e3bc8428facdefd060e Mon Sep 17 00:00:00 2001
From: ram <ram>
Date: Mon, 18 Mar 1991 20:54:43 +0000
Subject: [PATCH] Added a switch the disable the complementing optimization of
 type checks (for testing its effectiveness.)

---
 compiler/checkgen.lisp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/compiler/checkgen.lisp b/compiler/checkgen.lisp
index 53617634c..6e5337073 100644
--- a/compiler/checkgen.lisp
+++ b/compiler/checkgen.lisp
@@ -7,7 +7,7 @@
 ;;; Scott Fahlman or slisp-group@cs.cmu.edu.
 ;;;
 (ext:file-comment
-  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/checkgen.lisp,v 1.17 1991/02/20 14:56:43 ram Exp $")
+  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/checkgen.lisp,v 1.18 1991/03/18 20:54:43 ram Exp $")
 ;;;
 ;;; **********************************************************************
 ;;;
@@ -138,6 +138,10 @@
 	    count)))
 
 
+;;; Switch to disable check complementing, for evaluation.
+;;;
+(defvar *complement-type-checks* t)
+
 ;;; MAYBE-NEGATE-CHECK  --  Internal
 ;;;
 ;;;    Cont is a continuation we are doing a type check on and Types is a list
@@ -172,7 +176,8 @@
 				     (weak (maybe-weaken-check c cont)))
 				 (if (and diff
 					  (< (type-test-cost diff)
-					     (type-test-cost weak)))
+					     (type-test-cost weak))
+					  *complement-type-checks*)
 				     (list t diff c)
 				     (list nil weak c))))
 			   ptypes types)))
-- 
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